You may have noticed things look a little different around here - we've switched to a new platform (XenForo) and have some new forum styles and features. This how-to guide will help you find your way around.
If you find anything that looks strange, post it in this thread.

I can't answer your first question (though I'd be interested in an answer for that as well) but you wouldn't want to defragment SSDs as it adds unnecessary wear and provides what is essentially no benefits, thus lowers the length of their life.

As for the lifespan, an SSD should long outlive comparable spinners in theory, but at the moment, no one's owned a true mainstream SSD for more than a year to a year and a half, so these claims really aren't particularly verifiable.